Question

Figure 21-12 shows four situations in which five charged
particles are evenly spaced along the axis. The charge values are
indicated except for the central particle, which has the same
charge in all four situations.

Fig.21-12.
Rank the situations according to the magnitude of the net
electrostatic force on the central particle, greatest first (use
only the symbols > or =, for example 2=3>1>4).